My hot and cistern fed cold water pressure is really poor and showers
fed from this barely work.
I had a poke around in the loft and noticed the cold tank sat on
chipboard on the ceiling joists. So from a shower point of view I have
about 18" head. Would it be a good idea to get a load of 6x2 and raise
the tank, extending the copper. I have room to raise it 5ft nearly and
there is a supporting wall nearby that I can tie into. Its a big tank
and must weigh a ton.
If I remember my school physics, doing that will increase pressure but
are there any other implications? For example, is the hot water
cylinder still OK? Will it unveal a load of dry joints in my system?
Raising the tank *will* increase the pressure - but not by enough to induce
leaks in your hot tank and pipework. [Incidentally, dry joints are what you
want! - they are only bad in electrical/electronic circuits.]
You may *still* not get an adequate flow from your shower, though. A better
solution would be to install a shower pump in the hot and cold feeds to the
shower - triggered by a flow switch so that, as soon as you get *some* flow
due to gravity, the pump kicks in and gives you a half-way decent shower.
[You could also use the pump to fill the bath a bit faster if you have
common feeds to the bath and shower, and install the pump before the split].
Make sure that you have an adequately sized feed pipe from the cold tank
down into the bottom of the hot cylinder. This should be at least 22mm -
It will certainly increase the pressure and flow rate. However, it probably
will be insufficient to make it acceptable. You might wish to consider using
a pump instead. Probably less work to install as well. Pumps start from
around 99 quid.
I'd say do both, raise tank and fit pump, with 28mm piping. Unless the input
side of the pump gets enough flow, there is a tendency to suck air into the
system from the hot tank vent tube.
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